In a small town people disappear without a trace, including Rina’s brother. The search leads nowhere, and that plunges the girl into depression. To somehow pull her out of this state, friends invite her to a castle that has recently been restored. During the tour, for some reason she ends up in an unfamiliar hall with no way out. Rina finds herself in another world and becomes a participant in a dangerous test that decides her life. But questions remain: what happened to her brother? is he alive? and did he visit the castle before Rina?